package com.itheima.leyou;

import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;

public class Test {
    public static void main(String[] args){
        Map map = new LinkedHashMap();
        map.put("a","123");
        map.put("b","456");
        System.out.println(map.toString());
    }
}
